Original owner of 01' Tundra SR5 V6 with 151,000 miles. Great truck, but now getting CEL and diagnostic code P1135. I replaced the rear (heated) O2 Sensor, but still have the code & CEL. Anyone know where to look next?
Yup, Tried clearing code with OBDII scanner and also disconnected battery. Code comes right back on second engine start... I've done some more research, and found I may have changed the wrong sensor... I read now that this code is caused by the FWD O2 sensor (before cat converter). I ordered a new sensor,,, will see what it does.